Digitally Tunable MDAC Based State Variable Filter Reference Design


Design files


This MDAC based state variable filter offers highly accurate digital tuning of gain, center/cut off frequency, and quality factor. This circuit provides three separate filter outputs: low pass, band pass, and high pass that can be accessed simultaneously.  This circuit is suitable for a broad range of applications requiring accurate digital filter tuning from audio to industrial and more!

  • Contains Theory, Component Selection, TINA-TI Simulation, Measured Results, PCB Layout, Modifications
  • Digitally tunable high, band, or low pass filter
    • Gain range -53.13 dB to 6.01 dB
    • Frequency range 1.99 Hz to 28.76 kHz
    • Quality factor range 0.46 to 2.14

Design files & products

Design files

Download ready-to-use system files to speed your design process.

TIDC710.ZIP (2108 K)

Detailed schematic diagram for design layout and components


Detailed schematic diagram for design layout and components


Complete listing of design components, reference designators, and manufacturers/part numbers

TIDC711.ZIP (1823 K)

Design file that contains information on physical board layer of design PCB


Includes TI products in the design and potential alternatives.

Precision DACs (<=10MSPS)

DAC881216-Bit, Dual Serial Input Multiplying Digital-to-Analog Converter

Data sheet document-pdfAcrobat PDF open-in-new HTML
Precision op amps (Vos<1mV)

OPA277Dual, 36-V, 10µV offset, 0.1µV/˚C drift, bipolar, operational amplifier

Data sheet document-pdfAcrobat PDF open-in-new HTML

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Support software

TIPD160 Simulation – TIDC712.ZIP (55 K)

Technical documentation

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Type Title Date
* User guide Digitally Tunable MDAC-Based State Variable Filter Reference Design (TIPD160) Sep. 19, 2014
Technical article SPICE-ing up Precision DACs Oct. 24, 2014

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